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/usr/share/psychtoolbox-3/PsychSignal/MatMax.m is in psychtoolbox-3-common 3.0.14.20170103+git6-g605ff5c.dfsg1-1build1.

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function [maxval] = MatMax(image)
% [maxval] = MatMax(image)
% Find the maximum value in a matrix.

% 6/13/12    dn     Generalize to N-D input by forwarding to MaxAll()

maxval = MaxAll(image);